fix(data/smartphone): set base_model_slug for xcute 2005-2006 phones

Author: Seungpyo1007

data/smartphone/xcute/2005/dv1.json

@@ -1,5 +1,6 @@
 {
   "slug": "dv1",
+  "base_model_slug": "dv1",
   "name": "DV1",
   "brand": "xcute",
   "soc": "xcute-mobile-platform-2005",

data/smartphone/xcute/2005/dv2.json

@@ -1,5 +1,6 @@
 {
   "slug": "dv2",
+  "base_model_slug": "dv2",
   "name": "DV2",
   "brand": "xcute",
   "soc": "xcute-mobile-platform-2005",

data/smartphone/xcute/2006/dv50.json

@@ -1,5 +1,6 @@
 {
   "slug": "dv50",
+  "base_model_slug": "dv50",
   "name": "DV50",
   "brand": "xcute",
   "soc": "xcute-mobile-platform-2006",

data/smartphone/xcute/2006/dv80.json

@@ -1,5 +1,6 @@
 {
   "slug": "dv80",
+  "base_model_slug": "dv80",
   "name": "DV80",
   "brand": "xcute",
   "soc": "xcute-mobile-platform-2006",